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What is a CVN (CVV2/CVC2)?

The CVN code (or CVV2/CVC2) is a special 3-4 digit code used as an additional security measure for online transactions.

On most cards, this number is a 3-digit code on the back of your card, near the signature strip. On American Express cards, the 4-digit code is above and to the right of your card number on the front of the card.